Taking the power plant denitrification engineering as the background,applying ANSYS software,according to actual engineering struc-ture forms and sizes,the paper establishes three-dimensional finite element model of SCR reactor ontological-structure,takes self-weight,catalyst load,dust load,flue gas pressure and wind load and its composite working conditions into consideration,and calculates stress and deformation of the reactor body and various parts,which has provided some guidance for similar engineering design and optimization.%以某电厂的脱硝工程为背景，利用 ANSYS 软件，按照实际工程的结构形式和尺寸，建立了选择性催化还原法（SCR）反应器本体结构三维有限元模型，在考虑自重、催化剂荷载、积灰荷载、烟气压力和风荷载及其组合工况下，计算反应器本体及各部件的应力和变形，为实际工程设计和优化提供依据。
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